34
Start
-
up
•
Disconnect the motor from the mains.
•
Remove the priming plug located on the upper part of the pump body, figure 24. Item1.
•
Pour liquid through the delivery line until it overflows through the priming hole.
•
While priming, rotate the pump shaft by hand to break any sticking.
•
Replace the priming plug in its position.
•
If the bearings are lubricated by oil, it is necessary to check the correct oil level. If this is not the case, fill the
bearings.
•
All shaft protections such as e.g. coupling core protector, must be in place and firmly fastened (screws
tightened), before starting the equipment.
Never run a pump dry. Most centrifugal pumps have a mechanical seal or stuffing box, therefore they cannot be run dry
under any working conditions, otherwise the sealing elements will be seriously damaged.
Before starting the pump, the suction pipe must be completely filled with the fluid to be pumped, this allows the pump to
start always primed and prevents the accumulation of air in the suction system. The procedure is as follows:
6.2
Pump Priming
!
CAUTION
Start
-
up
6.1
Before start up
After a pump has been installed and all mechanical, hydraulic and electrical connections have been made, it is ready for
commissioning. However, prior to initial start-up, the following is recommended:
1
Figure 24
6.3
Minimum Flow Rate
It must be taken into account that there is a minimum flow rate at which the pump must work, which is given by the
temperature of the pumped fluid, according to the following table.
0 ºC < T < 50 ºC => 20% of the maximum efficiency point Flow Rate
50 ºC < T < 80 ºC => 30% of the maximum efficiency point Flow Rate
6.4
Pumped Fluid Density
The power required for pump operation increases directly with the density of the pumped fluid. In order not to overload the
electric motor, it must be ensured that the pumped fluid corresponds to that which was originally considered for the
selection of the pump and its motor.
6.5
Oil Filling
In the case of pump model L80 4 and 5 stages oil lubricated pumps, the pump leaves the factory without oil in the bearing
housing. Once assembled, it must be filled, see section 7.3.1.- Oil filling.
Summary of Contents for L Series
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